7 Understanding Data Access

This chapter describes one of the most important functions of a session, which is to provide access to a data source. This chapter describes the concepts behind data access within a session that are unique to EclipseLink.

This chapter includes the following sections:

• About Externally Managed Transactional Data Sources

• About Data Source Login Types

• About Data Source Platform Types

• About Authentication

• About Connections

• About Connection Pools

• About Data Partitioning Policies

• About Tenant Isolation

• About Heterogeneous Batch Writing